EXHIBIT 31.1

                                 CERTIFICATIONS

I, W. Brent LaGere, certify that:

1.  I have reviewed this quarterly report on Form 10-Q of Chandler (U.S.A.),
    Inc.;

2.  Based on my knowledge, this report does not contain any untrue statement
    of a material fact or omit to state a material fact necessary to make
    the statements made, in light of the circumstances under which such
    statements were made, not misleading with respect to the period covered
    by this report;

3.  Based on my knowledge, the financial statements, and other financial
    information included in this report, fairly present in all material
    respects the financial condition, results of operations and cash flows
    of the registrant as of, and for, the periods presented in this report;

4.  The registrant's other certifying officer(s) and I are responsible for
    establishing and maintaining disclosure controls and procedures (as
    defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the
    registrant and have:

      a)  Designed such disclosure controls and procedures, or caused such
      disclosure controls and procedures to be designed under our
      supervision, to ensure that material information relating to the
      registrant, including its consolidated subsidiaries, is made known
      to us by others within those entities, particularly during the
      period in which this report is being prepared;

      b)  Evaluated the effectiveness of the registrant's disclosure
      controls and procedures and presented in this report our conclusions
      about the effectiveness of the disclosure controls and procedures,
      as of the end of the period covered by this report based on such
      evaluation; and

      c)  Disclosed in this report any change in the registrant's internal
      control over financial reporting that occurred during the registrant's
      most recent fiscal quarter (the registrant's fourth fiscal quarter in
      the case of an annual report) that has materially affected, or is
      reasonably likely to materially affect, the registrant's internal
      control over financial reporting; and

5.  The registrant's other certifying officer(s) and I have disclosed, based
    on our most recent evaluation of internal control over financial
    reporting, to the registrant's auditors and the audit committee of
    registrant's board of directors (or persons performing the equivalent
    functions):

      a)  All significant deficiencies and material weaknesses in the
      design or operation of internal control over financial reporting
      which are reasonably likely to adversely affect the registrant's
      ability to record, process, summarize and report financial
      information; and

      b)  Any fraud, whether or not material, that involves management or
      other employees who have a significant role in the registrant's
      internal control over financial reporting.


Date:  August 6, 2007



                                               /s/ W. Brent LaGere
                                               --------------------------------
                                               W. Brent LaGere
                                               Chairman of the Board and
                                               Chief Executive Officer
                                                                 EXHIBIT 31.1
                                                                  (CONTINUED)

                                  CERTIFICATIONS

I, Mark C. Hart, certify that:

1.  I have reviewed this quarterly report on Form 10-Q of Chandler (U.S.A.),
    Inc.;

2.  Based on my knowledge, this report does not contain any untrue statement
    of a material fact or omit to state a material fact necessary to make
    the statements made, in light of the circumstances under which such
    statements were made, not misleading with respect to the period covered
    by this report;

3.  Based on my knowledge, the financial statements, and other financial
    information included in this report, fairly present in all material
    respects the financial condition, results of operations and cash flows
    of the registrant as of, and for, the periods presented in this report;

4.  The registrant's other certifying officer(s) and I are responsible for
    establishing and maintaining disclosure controls and procedures (as
    defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the
    registrant and have:

    a)  Designed such disclosure controls and procedures, or caused such
    disclosure controls and procedures to be designed under our supervision,
    to ensure that material information relating to the registrant,
    including its consolidated subsidiaries, is made known to us by others
    within those entities, particularly during the period in which this
    report is being prepared;

    b)  Evaluated the effectiveness of the registrant's disclosure controls
    and procedures and presented in this report our conclusions about the
    effectiveness of the disclosure controls and procedures, as of the end
    of the period covered by this report based on such evaluation; and

    c)  Disclosed in this report any change in the registrant's internal
    control over financial reporting that occurred during the registrant's
    most recent fiscal quarter (the registrant's fourth fiscal quarter in
    the case of an annual report) that has materially affected, or is
    reasonably likely to materially affect, the registrant's internal
    control over financial reporting; and

5.  The registrant's other certifying officer(s) and I have disclosed, based
    on our most recent evaluation of internal control over financial
    reporting, to the registrant's auditors and the audit committee of
    registrant's board of directors (or persons performing the equivalent
    functions):

    a)  All significant deficiencies and material weaknesses in the design
    or operation of internal control over financial reporting which are
    reasonably likely to adversely affect the registrant's ability to
    record, process, summarize and report financial information; and

    b)  Any fraud, whether or not material, that involves management or
    other employees who have a significant role in the registrant's
    internal control over financial reporting.


Date:  August 6, 2007



                                               /s/ Mark C. Hart
                                               --------------------------------
                                               Mark C. Hart
                                               Senior Vice President - Finance,
                                               Chief Financial Officer
                                               and Treasurer